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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba5989e453331d26aff585ae5d3c04434988f53b0e6607959a0ffa45f01e92a' 
  AND token = 'ajnR/yKl7RLuJwhdkka9CUkFphEEgMqZydT0LZ/Kn3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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