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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72954c8ff2a251c0b6a75bc516ec841a46616344015caf61492ea9dd19da790a' 
  AND token = 'NepKBi946VqwvssN+PlRdVcF+2M1m5eHPCQlHp6T0HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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