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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6984248b0e604a39c6a79b180743df788b96611f39d83d563af24df616974b07' 
  AND token = 'xdZdCLe8R/BFZa/kSvTNusfb7m/nf90LBRgpWt80EHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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