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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96acbab18762fb5faa957b3bcb24e8bbd2c3bc4db7563076bd99858999eff0dd' 
  AND token = 'VHA2VStitu8/sRBMPA/YGFazE1kkFvflj72wP4nnkX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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