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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be637e996e9028e049a656d3a5c15e03d3dae731096b565a1b0b1055849e6f9e' 
  AND token = '/gnNmSbwZll3satUj07cedtBhtS1yrZdtkvFHcR5JN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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