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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df974894277afa4e82fe0f9c1c034f302af84967330402d66ea07a60bff6c303' 
  AND token = 'YBiGCpb6Fcwpk6Sg4x7tX65i4hcD7uLVMNs897I8w5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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