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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98dba363305e7e173c7bbf393901535f18a6f584a474e44c05c9d1bf0cea2f19' 
  AND token = 'tHMfkL+euANbL5hNlNdx8+3EIkH5NJKNbwACbsOPMpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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