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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3fc7a02fb4c9ac0dbfa95a2415e29b3c26e4c9603387d60a0461681d98ef87' 
  AND token = 'SQVhkJAVQDZ+KGptpTYP7mPeCtywE1SbxdX1bpAbCrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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