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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5b832f06d1f89c19c68b70dff4fbd7c5d4232dde10094713af2b4899c9738d' 
  AND token = '10yq0bQvmnZymLbVsr/uJ4mB0IuB8kBLxcW0Fp3aPn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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