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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bba344ac31f7395f9344cf4eff3a51d7d8c02063a31478d1c7582b615b2f7c6' 
  AND token = 'kpLB8MX2dTdr+ysVi0R51bTRL4152cRukPcuwKQPsNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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