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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905034b244af5f7fa20b06b4efc143ca3b51005645421e6e1349cf2d3c691fca' 
  AND token = 'K56/rOCPhFXMMXKnhYcbRM4Q0rgB5cxAH42QWQpsLaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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