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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b52d9c2882c422342841fa3e3185dbaaabd9043e581291e26e101990df4ba3' 
  AND token = 're2aMPsAdeu8eWhfhO+bmeuifiqWZXi2SsyPEpuL9nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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