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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d3f72baf5f90d2079b2d682a1e9b154f1192d751211d49e567116690968b77' 
  AND token = 's8qk42ndsbCffmNxk9+tsF70fsH4b14Lza273hRQ7xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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