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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696c01f08f9da9930c592af9058144e789ab145c829d4645a8ec4a4c7c9356b1' 
  AND token = '/KqwdzAe1GqJIR9pTCDvKYgRtWxkfbDtlF2x+fSNNRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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