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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175e0e7c464eca93c8a3e44f63e3256baf02ec05a30c89641e90f2c58da8e83b' 
  AND token = 'e+6V3AS9I0c2D7qrrn7Au5yZ8+Q/Ki3vMaA5H993Mqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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