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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b7414936a3293e9621b489088df5853fc3d18ecf5a3ed8f8fe80b4fc88c2a1' 
  AND token = 'TK7r2bhf8GDFhLoi8gyms1frshhtIOEasVb+Brlclr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}