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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1a9fbaf28668357eeeb151421f730a85912b0563499a9a1b102daff6b6cc02' 
  AND token = '7FOfO/caZmclCYy2x3ZlQew0T0MSv6EDiYMBzXEP1oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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