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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4847b09447383735f6d8233a7c65994dc4d4e3022c1c5c48a1b85364f06f4ead' 
  AND token = 'uAoWYUmP06bZHGnnH2lj2b74oTlhQJhO2kzFRHKG0fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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